Ore-treating process.



PATBNTED MAR. 17, 1908.

W. G. SWART.

ORE TREATING PROCESS.

APPLICATION FILED rmmn, 1905.

ATTORNEYS twig. ummm;

kae

WALTER G. SWART, OF DENVER, COLORADO.

ORE-TREATING. PROCESS.

Specification of Letters Patent.

Patented March 17, 1908.

Application led February 25, 1905. i Serial No. 247,211.

To all 107mm tnaq/ commu Beit known that l, llxixrnr. Swim'r, a citizen oi' thc United States, and resident ol' Denver, in the county of .Denver and .State of Colorado, have 'invented certain new and useful Improvements in (,)rc-'l`rcat`i1'ig Processes, of which the 'following is a specification, taken in connection with thc accompanying drawings, which l'orm a part ol' the same.

This invention relates to ore-treating processes and relates especially to processes for roasting zinc hlende, galcna' or other dillicultly roasting -sullid ores, preferably in a continuous manner and in simultaneously roasting, preferably contii'iuously, and out ol' contact with such ores, pyritical or other sulfur-bearing heating material, the hot sulfurous gases from said material being led into substantial contact with the partly desulfurized ore preferably passing in the direction opposite to the feed of said ore so as to l heat the saine and to mix with the sull'urous used in carrying out this invention.

gases evolved therefrom.

Figure 1 illustrates in perspective, partly in section, a form ot' apparatus which may be Fig. 2 is a vertical sectional view of another form ol' apparatus. Fig. 3 shows still another form oi roaster.

rl}he novel 'form f-f .caster indicated in Fig. 1 may be used for carrying out this invention. 'The casing 34 which indicated of metal is supported in a heavy masonry or similar setting 35 which materiallyV decreases thc heat radiation. A series of hcarths or shelves oi' suitable material are mounted Within thisl casing, each hearth being substantially divided by diametrical slots, sut-h as 21 and 12] which form the two hearths 14 and 114 on this same level for the treatment of dill'erentl material, if desired. The other hearths are divided in a similar manner. The nonalined slots 21, 22, 23, form a plurality of hearths on each level, each slot bein(r arranged as indicated over the rear ot the hearth below.

.If desired, a suitable grate 58 may bc arranged below the series ot' hearths and. may be tired through the doors 59, in the ordinarv Way. Tlle gases oi' combustion pass up i through the slots to some extent and also the alternate shelves are provided with collars 13 which form .nnular openings of any size desired near ..he center ot' tliese shelves. Also suitable circulating pipes 30, 31, 32 are arranged at suitablev intervals around the periphery olI thc other shelves so as to conduct the gases through thf` apparatus in a. zigzag manner before they pass out through the flue 2 to be utilized in a Glover tower or other acid making apparatus in the case of sulfurous gases. i

A vertical shaft 1 supported in the bearing 33 and rotated by any desired means in the direction of thc arrows, is indicated as passing axially through the roaster. This shaft is provided with a series of arms 12 on which are arranged suitable rahbles 28, 29 which as indicated are inclined in different directions. In this way when rotated in the direction of the arrows one set of rabbles moves material circumtercntially around the hearth to some extent and nlso displaces it outward. The rabbles on the other arm move the material around the hearth in the same direction and also displace it inward into the ath of the rabbles n the other arm. materia. is continuously turned over'and also slowly fed round the hearths in the 'direction ofthe arrows. Material may be fed into this roaster through one or more co'nveyers, such as the screw conveyer 10, driven by the rotating shaft '9 at any desired speed and thus feeding material from the hopper 6 into the tube 4 through which it drops onto the hearth 14. It is evident that this material will be fed around the hearth 14, will fall through the slot 21 upon the rear of the hearth 15 below and passin around this hearth in a similar' manner will pass over the hearths 16, 17, 18, 19 and 20, finally issuing through the discharge chute 57. It' desired, other different material may be fed by the conveyer 7 on the rotating shaft 8 from the hopper' 105 through the feed. tube 113 upon the hearth 114. This ma terial will be slowly fed through the roaster passing over the hearths 114, 115, 116, 117, 118, 119 and 120. before being discharged. These two materials will be kept separate throughout their passage through the rooster,

but, of course, the gases evolved from them` will mingle and one material can impart its heat to thc other in an obvious manner both by the heat of the gases by radintion and by conduction through the various hearths.

Zinc blende, galena or other dlflicultly roasting suld ores can be conveniently treated in'this apparatus by feeding the ore through the conveyer 10 over one series of roeressivel driven o' in. the Shape of su ious edfi'one heet which ie usuey neeesea'y in order te prope'y desufurize such ores can De reedy supplied by feeding through the othe" eonveye '.7 end ever the ilmie gases eee nchez* eed. betta? ed .Dee for mayeso be feeding om 'through meeting ote. d fumeee .of f i on anu :me'rted upon .,el v by sul able Tellers 112 engaging 'dlgs 3 7. The

, upper end of this funece communicates with e suitable chamber e0, eonleeing with he ueBQ 'o'the discharged ,'D'feses.v jx hopper 38 and V@huile 4l o1' oher suteblefeeding de vice may be used te properly Supply mateal to this furnace, the owe 'end of which roftefsaoy engegesthe heed i3 end disehefgefs matezol into the chute -z., the heating fm'- nace, which may be e romy-y fume'ee 4S, and similarly opeeited by the rolere 50 engaging the I'iigs 49 rotaeby engages the hood 43 end is supplied 'with material by the een ame gmte -emeh ehem for further utilize' ,utilized .for th desire-1i being mixed be 1 gases from seid. pyftee! m Verses fom he furnace Leed 43 and the immacgaeee evehfed hereim. and ee ma through the ue 39. The ere o3 ...eeh ,e

n treating ieuly e "f in zs apparatus, 'oe' oye, suce Mende, for instance, could be fed meneer into 'he ore femme iileren, he amount of eddon. sary te properly 3 e En or moving in *me epposie di* e the of "she ofe and mi lglmf? wrh in Seme eases other forme o' be used fel* ee'fymg out pal? 'of commumeatmg 1 eli ceases eepeme it n y l l ore reefed mi pepe beleg on oi' investe?.

s purpoeefee being 'riated m the g ythe .mueca lt is, of course, apparent tm et? er of eppeatus may be empoyed. he numne', orde' and exact natuc of the Steps described need Het be used in all cases in em'- rying out this invention or securing the adwhich Gemiste lende though the" evz'tee Seid `ore and in mixing the sulurons gufns i" in toasting diiioultly roasting ore. in feeststantial Contact with the partly clesului'ized zinc blende, said gases moving infthe o posite direction fromihe feed of said eleme so as to heat the saine and mix wit-n the gases evoivecl therefrom.

2. The ore Heating pi'oeess wi in roasting lifiicui'bly mastino; roasting pyitical heating m biallyT out of Contact v 'bi1 said ore, in sui); ing heat iron?. said pyritieal material t said pyritieai material with tile gases evolved from said ore.

3. The ore treating process which consists ing non-carbonaeeous oxidizable heatingmatelial, developing an excess oi' hea-'L on its oxidat-ionand in heating material to said Toasting ore and subsequently using the gases in the manufacture oflsulurie acid.

4. The ore treating process which consists in wasting diiiicultly 'roasting sulfid ore, in roasting non-carb onaoeous oxiiiizable heating materie-,i developing an excess of heat on its oxidation and in supplying heat from said 'heating material to said roasting ore and subsequently using the gases in the manufacture of sulfuric acid.

WALTER G. SWART.

Y'Vitnesses ANDREW C. KooNTz, C. L. SOUTHARD.

supplying heat from said y 

